diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index de35e8c..eb63206 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        compiler: [gcc-12, gcc-13]
+        compiler: [gcc-12, gcc-13, clang-17, clang-18]
     env:
       PREFIX: /usr/local/bin
       CC: ${{ matrix.compiler }}
@@ -27,6 +27,8 @@ jobs:
             libxrandr-dev \
             build-essential \
             gettext \
+            clang-17 \
+            clang-18 \
             gcc-12 \
             gcc-13
       - name: CC ver
diff --git a/AUTHORS b/AUTHORS
index 6258f38..041737f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -1,6 +1,6 @@
 #
 # Copyright © 2011-2019 Andreas Rönnquist.
-# Copyright © 2019-2021 Darren Salt.
+# Copyright © 2019-2025 Darren Salt.
 # This file is distributed under the same license
 # as the devilspie2 package, see COPYING file.
 #
diff --git a/Makefile b/Makefile
index b47afa8..b28dd00 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 #
 # This file is part of devilspie2
 # Copyright (C) 2011-2016 Andreas Rönnquist
-# Copyright (C) 2019-2021 Darren Salt
+# Copyright (C) 2019-2025 Darren Salt
 #
 # devilspie2 is free software: you can redistribute it and/or
 # modify it under the terms of the GNU General Public License as published
diff --git a/README.md b/README.md
index 8523cbf..1eb5e17 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-Copyright © 2011-2024 devilspie2 developers
+Copyright © 2011-2025 devilspie2 developers
 
 This file is distributed under the same licence as the devilspie2 package
 (see [COPYING](COPYING)).
@@ -10,7 +10,7 @@ It will read Lua scripts from a folder and run them whenever a window is
 opened, and the rules in them are applied on the window. (See the
 [Configuration section](#configuration) for more details.)
 
-Unfortunately the rules of the original Devil's Pie are not supported.
+Unfortunately, the rules of the original Devil's Pie are not supported.
 
 `devilspie2` will load all the Lua files in this folder in alphabetical order.
 
@@ -73,7 +73,7 @@ scripts_window_close = {
 With this, both `file1.lua` and `file2.lua` will be called whenever a window
 is closed.
 
-As of v0.46, each script has 5 seconds to do its job ane exit or it will be
+As of v0.46, each script has 5 seconds to do its job and exit or it will be
 unceremoniously interrupted.
 
 ## Scripting
@@ -86,8 +86,8 @@ The scripting language used is [Lua](https://www.lua.org/).
 Tips:
 
 * If you're going to be testing certain window properties a lot, it's best to
-  assign those property values to variables then to test the variables.
-* String comparison is case sensitive.  Comparing `SomeProgram` with
+  assign those property values to variables and then test against these.
+* String comparison is case-sensitive.  Comparing `SomeProgram` with
   `someprogram` will not report equality.
 
 
@@ -138,6 +138,13 @@ information:
 
   *(Available from version 0.44)*
 
+* `get_process_owner()`
+  <a name="user-content-get-process-owner" />
+    
+    Returns the username who owns the process owning the current window.
+    This is done by getting the owner (UID) of `/proc/<pid>/comm` with `stat()` 
+    and mapping it to a username with `getpwuid()`.
+
 * `get_window_geometry()`
   <a name="user-content-get-window-geometry" />
 
@@ -245,7 +252,7 @@ information:
   <a name="user-content-window-property-is-utf8" />
 
   Returns whether the named window property is UTF-8.
-  (Always returns `true` for properties which are converted to string.)
+  (Always returns `true` for properties which are converted to string)
 
   Returns `nil` if the property doesn't exist.
 
@@ -271,7 +278,7 @@ information:
 * `get_window_xid()`
   <a name="user-content-get-window-xid" />
 
-  Returns the X window id of the current window.
+  Returns the X window ID of the current window.
 
 * `get_window_class()`
   <a name="user-content-get-window-class" />
@@ -320,7 +327,7 @@ information:
 
 ### Setters
 
-And the rest of the commands are used to modify the properties of the windows:
+The rest of the commands are used to modify the properties of the windows:
 
 * `set_adjust_for_decoration([bool])`
   <a name="user-content-set-adjust-for-decoration" />
@@ -531,7 +538,7 @@ And the rest of the commands are used to modify the properties of the windows:
 * `unstick_window()`
   <a name="user-content-unstick-window" />
 
-  Ask the window manager not to have window's position fixed on the screen
+  Ask the window manager not to have the window's position fixed on the screen
   when the workspace or viewport scrolls.
 
 * `set_skip_tasklist(bool skip)`
@@ -698,7 +705,7 @@ And the rest of the commands are used to modify the properties of the windows:
 
   With parameters, set the position and size of a window.
 
-  Without, returns the position and size of a window.
+  When no parameters are passed, returns the position and size of a window.
 
 ### Utilities
 
@@ -832,3 +839,4 @@ See [AUTHORS](AUTHORS).
 * See also: https://github.com/dsalt/devilspie
 
 * IRC: irc://irc.libera.chat/#devilspie2
+
diff --git a/devilspie2.1 b/devilspie2.1
index c43019d..8080c69 100644
--- a/devilspie2.1
+++ b/devilspie2.1
@@ -1,6 +1,6 @@
 .\"
 .\" Copyright © 2011-2017 Andreas Rönnquist.
-.\" Copyright © 2021-2024 Darren Salt.
+.\" Copyright © 2021-2025 Darren Salt.
 .\" This file is distributed under the same license
 .\" as the devilspie2 package, see COPYING file.
 .\"
diff --git a/src/compat.h b/src/compat.h
index 25ade54..0ca29fe 100644
--- a/src/compat.h
+++ b/src/compat.h
@@ -1,6 +1,6 @@
 /**
  *	This file is part of devilspie2
- *	Copyright (C) 2021 Darren Salt
+ *	Copyright (C) 2025 Darren Salt
  *
  *	devilspie2 is free software: you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License as published
diff --git a/src/error_strings.c b/src/error_strings.c
index a04b6af..83e3afa 100644
--- a/src/error_strings.c
+++ b/src/error_strings.c
@@ -1,7 +1,7 @@
 /**
  *	This file is part of devilspie2
  *	Copyright (C) 2012-2017 Andreas Rönnquist
- *	Copyright (C) 2019-2021 Darren Salt
+ *	Copyright (C) 2019-2025 Darren Salt
  *
  *	devilspie2 is free software: you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License as published
diff --git a/src/intl.h b/src/intl.h
index 2e1a809..4716eff 100644
--- a/src/intl.h
+++ b/src/intl.h
@@ -1,7 +1,7 @@
 /**
  *	This file is part of devilspie2
  *	Copyright (C) 2001 Havoc Pennington, 2011-2019 Andreas Rönnquist
- *	Copyright (C) 2019-2021 Darren Salt
+ *	Copyright (C) 2019-2025 Darren Salt
  *
  *	devilspie2 is free software: you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License as published
diff --git a/src/script.c b/src/script.c
index 399680b..0e9369d 100644
--- a/src/script.c
+++ b/src/script.c
@@ -1,7 +1,7 @@
 /**
  *	This file is part of devilspie2
  *	Copyright (C) 2011-2019 Andreas Rönnquist
- *	Copyright (C) 2019-2021 Darren Salt
+ *	Copyright (C) 2019-2025 Darren Salt
  *
  *	devilspie2 is free software: you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License as published
@@ -202,6 +202,8 @@ register_cfunctions(lua_State *lua)
 
 	DP2_REGISTER(lua, get_process_name);
 
+	DP2_REGISTER(lua, get_process_owner);
+
 	DP2_REGISTER(lua, millisleep);
 }
 
diff --git a/src/script_functions.c b/src/script_functions.c
index 240d582..8cc913c 100644
--- a/src/script_functions.c
+++ b/src/script_functions.c
@@ -1,7 +1,7 @@
 /**
  *	This file is part of devilspie2
  *	Copyright (C) 2011-2019 Andreas Rönnquist
- *	Copyright (C) 2019-2021 Darren Salt
+ *	Copyright (C) 2019-2025 Darren Salt
  *
  *	devilspie2 is free software: you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License as published
@@ -22,6 +22,9 @@
 #include <string.h>
 #include <sys/types.h>
 #include <errno.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/stat.h>
 
 #define WNCK_I_KNOW_THIS_IS_UNSTABLE
 #include <libwnck/libwnck.h>
@@ -1746,7 +1749,9 @@ int c_set_window_property(lua_State *lua)
 
 	switch (type) {
 	case LUA_TSTRING:
+	{
 		gboolean use_utf8 = default_use_utf8;
+	    
 		if (top > 2) {
 			type = lua_type(lua, 3);
 			if (type != LUA_TBOOLEAN) {
@@ -1759,7 +1764,7 @@ int c_set_window_property(lua_State *lua)
 			my_wnck_set_string_property(wnck_window_get_xid(window), my_wnck_atom_get(property),
 						    lua_tostring(lua, 2), use_utf8);
 		break;
-
+	}
 	case LUA_TNUMBER:
 		if (!devilspie2_emulate && window)
 			my_wnck_set_cardinal_property(wnck_window_get_xid(window), my_wnck_atom_get(property),
@@ -1929,6 +1934,7 @@ int c_set_viewport(lua_State *lua)
 	switch (top)
 	{
 	case 1:
+	{
 		WnckScreen *screen;
 		int x;
 		int type = lua_type(lua, 1);
@@ -1982,7 +1988,9 @@ int c_set_viewport(lua_State *lua)
 
 		lua_pushboolean(lua, TRUE);
 		return 1;
+	}
 	case 2:
+	{
 		int type1 = lua_type(lua, 1);
 		int type2 = lua_type(lua, 2);
 
@@ -2032,6 +2040,7 @@ int c_set_viewport(lua_State *lua)
 
 		lua_pushboolean(lua, TRUE);
 		return 1;
+	    }
 	}
 	return 0;
 }
@@ -2353,6 +2362,7 @@ int c_xy(lua_State *lua)
 	switch (top)
 	{
 	case 0:
+	{
 		// return the xy coordinates of the window
 
 		WnckWindow *window = get_current_window();
@@ -2368,7 +2378,9 @@ int c_xy(lua_State *lua)
 			return 2;
 		}
 		break;
+	}
 	case 2:
+	{
 		// set the coordinates of the window
 
 		int type1 = lua_type(lua, 1);
@@ -2397,6 +2409,7 @@ int c_xy(lua_State *lua)
 			}
 		}
 		break;
+	    }
 	}
 	return 0;
 }
@@ -2415,54 +2428,58 @@ int c_xywh(lua_State *lua)
 
 	switch (top)
 	{
-	case 0:
-		// Return the xywh settings of the window
+	    case 0:
+	    {
+		    // Return the xywh settings of the window
 
-		WnckWindow *window = get_current_window();
-		if (window) {
+		    WnckWindow *window = get_current_window();
+		    if (window) {
 
-			int x, y, width, height;
+			    int x, y, width, height;
 
-			wnck_window_get_geometry(window, &x, &y, &width, &height);
+			    wnck_window_get_geometry(window, &x, &y, &width, &height);
 
-			lua_pushinteger(lua, x);
-			lua_pushinteger(lua, y);
-			lua_pushinteger(lua, width);
-			lua_pushinteger(lua, height);
+			    lua_pushinteger(lua, x);
+			    lua_pushinteger(lua, y);
+			    lua_pushinteger(lua, width);
+			    lua_pushinteger(lua, height);
 
-			return 4;
-		}
-		break;
-	case 4:
-		// Set the xywh settings in the window
+			    return 4;
+		    }
+		    break;
+	    }	
+	    case 4:
+	    {
+		    // Set the xywh settings in the window
 
 
-		int type1 = lua_type(lua, 1);
-		int type2 = lua_type(lua, 2);
-		int type3 = lua_type(lua, 3);
-		int type4 = lua_type(lua, 4);
+		    int type1 = lua_type(lua, 1);
+		    int type2 = lua_type(lua, 2);
+		    int type3 = lua_type(lua, 3);
+		    int type4 = lua_type(lua, 4);
 
-		if ((type1 != LUA_TNUMBER) ||
-		        (type2 != LUA_TNUMBER) ||
-		        (type3 != LUA_TNUMBER) ||
-		        (type4 != LUA_TNUMBER)) {
-			luaL_error(lua, "xywh: %s", number_expected_as_indata_error);
-			return 0;
-		}
+		    if ((type1 != LUA_TNUMBER) ||
+			    (type2 != LUA_TNUMBER) ||
+			    (type3 != LUA_TNUMBER) ||
+			    (type4 != LUA_TNUMBER)) {
+			    luaL_error(lua, "xywh: %s", number_expected_as_indata_error);
+			    return 0;
+		    }
 
-		int x = lua_tonumber(lua, 1);
-		int y = lua_tonumber(lua, 2);
-		int xsize = lua_tonumber(lua, 3);
-		int ysize = lua_tonumber(lua, 4);
+		    int x = lua_tonumber(lua, 1);
+		    int y = lua_tonumber(lua, 2);
+		    int xsize = lua_tonumber(lua, 3);
+		    int ysize = lua_tonumber(lua, 4);
 
-		if (!devilspie2_emulate) {
-			WnckWindow *window = get_current_window();
-			if (window) {
-				set_window_geometry(window, x, y, xsize, ysize, adjusting_for_decoration);
-			}
-		}
+		    if (!devilspie2_emulate) {
+			    WnckWindow *window = get_current_window();
+			    if (window) {
+				    set_window_geometry(window, x, y, xsize, ysize, adjusting_for_decoration);
+			    }
+		    }
 
-		return 0;
+		    return 0;
+		}
 	}
 	return 0;
 }
@@ -2523,6 +2540,7 @@ int c_on_geometry_changed(lua_State *lua)
  */
 static ATTR_MALLOC gchar *c_get_process_name_INT_proc(lua_State *, pid_t);
 static ATTR_MALLOC gchar *c_get_process_name_INT_ps(lua_State *, pid_t);
+static ATTR_MALLOC gchar *c_get_process_owner_INT_proc(lua_State *, pid_t);
 
 int c_get_process_name(lua_State *lua)
 {
@@ -2608,6 +2626,47 @@ static gchar *c_get_process_name_INT_ps(lua_State *lua, pid_t pid)
 	return g_strdup(cmdname);
 }
 
+int c_get_process_owner(lua_State *lua)
+{
+	if (!check_param_count(lua, "get_process_owner", 0)) {
+                return 0;
+        }
+
+
+	WnckWindow *window = get_current_window();
+
+	if (window) {
+		pid_t pid = wnck_window_get_pid(window);
+
+		if (pid != 0) {
+			gchar *ownername = c_get_process_owner_INT_proc(lua, pid);
+			lua_pushstring(lua, ownername ? ownername : "");
+			g_free(ownername);
+			return 1;
+		}
+	}
+
+	lua_pushstring(lua, "");
+	return 1;
+}
+
+static gchar *c_get_process_owner_INT_proc(lua_State *lua, pid_t pid)
+{
+	char proc_comm_file[1024];
+	snprintf(proc_comm_file, sizeof(proc_comm_file), "/proc/%lu/comm", (unsigned long)pid);
+	struct stat info;
+	if (stat(proc_comm_file, &info) < 0){
+	    perror("stat");
+	    return NULL;
+	}
+	struct passwd *pw = getpwuid(info.st_uid);
+	if (pw != NULL){
+	    return g_strdup(pw->pw_name);
+	}
+	return NULL;
+}
+
+
 
 /**
  *
diff --git a/src/script_functions.h b/src/script_functions.h
index 6a2f2d0..87bffaa 100644
--- a/src/script_functions.h
+++ b/src/script_functions.h
@@ -143,6 +143,8 @@ int c_on_geometry_changed(lua_State *lua);
 
 int c_get_process_name(lua_State *lua);
 
+int c_get_process_owner(lua_State *lua);
+
 int c_millisleep(lua_State *lua);
 
 #endif /*__HEADER_SCRIPT_FUNCTIONS_*/
diff --git a/src/xutils.c b/src/xutils.c
index 19a698b..d6c501e 100644
--- a/src/xutils.c
+++ b/src/xutils.c
@@ -1,7 +1,7 @@
 /**
  *	This file is part of devilspie2
  *	Copyright (C) 2001 Havoc Pennington, 2011-2019 Andreas Rönnquist
- *	Copyright (C) 2019-2021 Darren Salt
+ *	Copyright (C) 2019-2025 Darren Salt
  *
  *	devilspie2 is free software: you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License as published
@@ -24,6 +24,7 @@
 #include <gdk/gdkx.h>
 #include <X11/Xlib.h>
 #include <string.h>
+#include <sys/types.h>
 
 // FIXME: retrieve screen position via wnck
 #include <X11/extensions/Xinerama.h>